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Holcim South Platte Combined SWSP September 18, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Ft 6243 Page 34 of <br /> 37 <br /> during the term of this approval. At least three years prior to completion of <br /> dewatering, a plan must be submitted that specifies how the post pumping <br /> dewatering depletions (including refilling of the pit) will be replaced in time, place <br /> and amount. <br /> 23.Prior to claiming any credit for the water returned to the stream system from <br /> dewatering in excess of lagged dewatering depletions (a net accretion), the Applicant <br /> must install a totalizing flow meter that accurately measures the quantity of water <br /> being pumped and returned to the stream system via dewatering operations and <br /> account on a real time basis for the actual dewatering depletions and accretions. No <br /> net accretion credits are sought by the Applicant for this approval period. <br /> 24. If dewatering of any of these sites is discontinued, the pit would fill, creating <br /> additional depletions to the stream system due to increased evaporation. To ensure <br /> that additional depletions to the river do not occur, a bond has been obtained through <br /> the DRMS for lining or backfilling of the pits. Therefore, if the dewatering is <br /> discontinued, these bonds can finance the completion of the lining of these pits or the <br /> backfilling, thus preventing depletions to the stream system. <br /> 25.The approval of this substitute water supply plan does not relieve the Applicant <br /> and/or landowner of the requirement to obtain a Water Court decree approving a <br /> permanent plan for augmentation or mitigation to ensure the permanent replacement <br /> of all depletions, including long-term evaporation losses and lagged depletions after <br /> gravel mining operations have ceased. <br /> 26. If reclamation of the mine sites will produce a permanent water surface exposing <br /> groundwater to evaporation, an application for a plan for augmentation must be filed <br /> with the Division 1 Water Court at least three (3) years prior to the completion of <br /> mining to include, but not be limited to, long-term evaporation losses and lagged <br /> depletions. If a lined pond results after reclamation, replacement of lagged <br /> depletions shall continue until there is no longer an effect on stream flow. According <br /> to the SWSP request, mining of material has ceased at the Jeronimus Pit, Hazeltine <br /> Pit, Platte Valley Pit, F-Street Pit, Brighton Pit, Distel Pit, and Wattenberg Pit. Since <br /> material mining has ceased at these sites, either the lakes must be lined or <br /> backfilled, or an application for a plan of augmentation for the site must be filed with <br /> the water court. In addition all lagged depletions shall continue to be replaced under <br /> a SWSP until there is no longer an effect on stream flow or a court approved <br /> augmentation plan is approved by the water court. Granting of this plan does not <br /> imply approval by this office of any such court application(s). <br /> 27.The Applicant should consider the effects of groundwater mounding and the need for <br />